function getAjaxResult(_url, _params, _async, _method, _callback) {
	if(_url == undefined || _url == '') {
		alert('url参数无效');
		return;
	}
	if(_params == undefined || _params == '') {
		alert('params参数无效');
		return;
	}
	if(typeof _params != 'object') {
		try{
			_params = JSON.parse(_params);
		} catch(e) {
			alert('params参数由'+(typeof _params)+'转为object失败');
			return;
		}
	}
	$.ajax({
		type: _method || 'GET',
		url: _url,
		async: _async || true,
		dataType: 'json',
		data: _params,
		beforeSend: function(XMLHttpRequest){
			
		},
		success: function(data, textStatus){
			//后端返回统一标准数据
			if(data.code == 200) {
				_callback(data);
			}else{
				alert(data.message);
			}
		},
	
		complete: function(XMLHttpRequest, textStatus){
	
		},
		error: function(e){
			console.log(_url)
			alert('请求服务器失败,请重试');
		}
	});
}
